Designated as pollutants are those substances or mixtures of substances which can cause harm to humans, animals, plants or other organisms.

Various standards and guidelines regulate the handling of these substances. EC Directive 2002/95/EC (RoHS) for restriction of the use of certain hazardous substances in electrical and electronic devices is a regulation for the utilization of hazardous substances in devices and components. Through this Directive, it is intended to ban injurious constituents from products or to reduce them to a minimum.